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2.3.8.2 Measurement of high turbidity values
High turbidity samples with more than 1100 NTU "overrange" may be diluted. The dilution
water should be a water with very low turbidity as described in chapter 2.3.7.1 "Preparing
dilution water".
For accurate dilution proceed as follows:
Mix the water sample well and pipette x ml of the water sample (see table below) into
a 100 ml volumetric flask. Fill with low turbidity water up to mark and mix gently.
Water sample
(x ml)
Multiplication factor
10
10
25
4
50
2
Fill the diluted water sample into the vial, perform reading and multiply the displayed result
with the multiplication factor.
Note:
The dilution of water sample may alter the characteristics of the suspended particles
and produce erroneous results.
2.3.8.3 Measurement of low turbidity values
Accurate and repeatable measurements of low turbidity values depend on exact mesurement
techniques.
Use a clean, unscratched and indexed vial.
Rinse the vial three times with the sample.
Allow the vial to stand for 1 -5 minutes so that bubbles can disappear.
Carefully invert the vial (so that settled particles dispense in the sample).
Place the vial in the sample chamber and press the Read/Avg-key.
Multiple perform the measurement, until is displayed a reproducible value (leave the
vial in the sample chamber).
Note the smallest steady and reproducible value.
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Содержание CW8200
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Страница 7: ...Part 1 Descriptions...
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